diff --git a/spec/data/work-dates.json b/spec/data/planned-dates.json
similarity index 100%
rename from spec/data/work-dates.json
rename to spec/data/planned-dates.json
diff --git a/spec/dayoff_spec.cr b/spec/dayoff_spec.cr
index a35f282..c8f1aa9 100644
--- a/spec/dayoff_spec.cr
+++ b/spec/dayoff_spec.cr
@@ -2,7 +2,7 @@ require "./spec_helper"
 
 describe Dayoff do
   it "can calc work hours" do
-    app = Dayoff::App.new("./spec/data/work-dates.json")
+    app = Dayoff::App.new("./spec/data/planned-dates.json")
     app.get_work_hours.should eq 20
   end
 end
diff --git a/src/dayoff.cr b/src/dayoff.cr
index 8295190..18b1afc 100644
--- a/src/dayoff.cr
+++ b/src/dayoff.cr
@@ -3,7 +3,7 @@ require "json"
 module Dayoff
   VERSION = "0.1.0"
 
-  class WorkDate
+  class PlannedDate
     JSON.mapping(
       date: String,
       hours: Int32,
@@ -11,16 +11,16 @@ module Dayoff
   end
 
   class App
-    def initialize(wh_path)
-      content = File.open(wh_path) do |file|
+    def initialize(pddates_path)
+      content = File.open(pddates_path) do |file|
         file.gets_to_end
       end
-      @wdates = Array(WorkDate).from_json(content)
+      @pdates = Array(PlannedDate).from_json(content)
     end
 
     def get_work_hours
       sum = 0
-      @wdates.each do |wd|
+      @pdates.each do |wd|
         sum += wd.hours
       end
       sum